1950 - I Need NOS Cylinder head and specs for 263 Super 50 Dynaflow str8

I'm rebuilting a 263 str 8 engine #57682065 for a 1950 Buick Super Eight 50 with Dynaflow VIN#5551918

I need a NOS (or used in very good condition) Cylinder Head: can someone tell me where I can find it?

I need also engine specifications to identify :
- Piston Ring Size
- Connecting Rod Bearings Size
- Main Bearing Size

Thanks!
 
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